Get the string representation of array by given delimiter in Java

Write a method, that takes an array of any type and a delimeter, return the string representation of array elements.

 

Signature

String toString(Object[] array, String delimiter)

 

Find the below working application.

 

 

ArrayAsString.java

package com.sample.app.arrays;

import java.util.StringJoiner;

public class ArrayAsString {

	public static String toString(final Object[] array, final String delimeter) {

		if (array == null || array.length == 0) {
			return "";
		}

		String delimeterToApply = delimeter;
		if (delimeter == null || delimeter.isEmpty()) {
			delimeterToApply = ",";
		}

		final StringJoiner stringJointer = new StringJoiner(delimeterToApply);

		for (Object obj : array) {
			if (obj == null) {
				stringJointer.add("null");
			} else {
				stringJointer.add(obj.toString());
			}
		}

		return stringJointer.toString();
	}

	public static void main(String[] args) {
		System.out.println(toString(new Integer[] {}, null));
		System.out.println(toString(new Integer[] { 2, 3, 5 }, "-->"));
		System.out.println(toString(new Integer[] { 2, null, 3, null, 5 }, "-->"));
	}
}

Output

2-->3-->5
2-->null-->3-->null-->5

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